Step stool



FIG. 1 is a perspective view of a step stool in accordance with my new design;

FIG. 2 is a left-side elevational view thereof, with the right-side elevational view being a mirror image thereof;

FIG. 3 is a front elevational view thereof, with the rear elevational view being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom view thereof, with portions of the step stool being illustrated in broken lines, which broken lines are for illustrative purposes only and form no part of the step stool.

The phantom lines shown in FIGS. 1–5 are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a step stool, as shown and described. 